Triple-gauge couplings in LHC diboson production: a SMEFT view from every angle

TL;DR

This paper analyzes WZ and WW production at the LHC within the SMEFT framework, incorporating NLO QCD corrections, to identify key observables sensitive to potential new physics effects in triple-gauge couplings.

Contribution

It provides a comprehensive SMEFT analysis of diboson production at NLO QCD, including CP-odd operators and polarization observables, highlighting sensitive measurements for new physics searches.

Findings

Identification of key LHC observables sensitive to SMEFT effects

Comparison of inclusive and fiducial selection impacts

Assessment of asymmetry observables for new physics signals

Abstract

This study explores fully leptonic WZ and WW production at the LHC within the SMEFT framework at NLO in QCD, focusing on both CP-even and CP-odd triple-gauge-coupling dimension-six operators. We investigate the off-shell processes, contrasting our findings in inclusive setups with those in the presence of realistic fiducial selections. Alongside the conventional kinematic observables, we examine polarisation-sensitive observables and angular coefficients. Moreover, we assess potential SMEFT effects on asymmetry observables. Through a sensitivity analysis, we identify critical LHC observables that are particularly sensitive to SMEFT-induced modifications, thereby shedding light on potential avenues for new-physics searches in diboson production at the LHC.